Question

18 tens 20 ones equals

Answer 1

In this question, you are given multiple number names and asked to add it. To answer this question it would be easier to split the description into a different part like this:
1. "18 tens" mean 18 * 10= 180
2. "20 ones" mean 20 *1= 20

If you add them, then you will got : 180+20= 200